Abstract
Ten years ago, highly excited states were found in $^{9}\mathrm{Li}$ and $^{10}\mathrm{Be}$ a few hundred kilovolts above the proton decay threshold. These physical states are too low in energy to be the isospin-stretched configuration of the decay channel (the isobaric analog or ${T}_{g}$). However, these states can be understood by a continuum cognizant shell model as strongly mixed states of lower isospin (${T}_{l}$), where the mixing is largely mediated by the open neutron channels but ushered in energy to be just above the proton threshold.
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